Subtract 81/18 from 12/4
1st number: 3 0/4, 2nd number: 4 9/18
12/4 - 81/18 is -3/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
12/4 = 12 × 9/4 × 9 = 108/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
81/18 = 81 × 2/18 × 2 = 162/36 - Subtract the two like fractions:
108/36 - 162/36 = 108 - 162/36 = -54/36 - After reducing the fraction, the answer is -3/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4-81/18 12/8-81/18 12/4-81/36 36/4-81/18 12/4-81/54 60/4-81/18 12/20-81/18 12/4-81/90 84/4-81/18 12/28-81/18